Kabul, Afghanistan (CNN) -- A suicide bomber clad as a farmer rode a donkey into a group of coalition and Afghan forces Tuesday and set off an explosion that killed three NATO-led soldiers and an interpreter, a provincial official said.

The incident, which occurred in eastern Afghanistan, in Wardak province, also injured four Afghan soldiers, according to Ataullah Khogyani, spokesman for Wardak's provincial governor.

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The Taliban militant movement, in an e-mail, claimed responsibility.

Khogyani said NATO's International Security Assistance Force and Afghan National Army soldiers were about to conduct a military operation in the area of the Sayed Abad district.

ISAF reported that three service members died after a bombing but didn't give their nationalities, in line with its policy of deferring identification to the relevant nations.